The textbook "Criminology Theory, Methods and Methodology" is intended for students of the University of Finance and Administration and the Faculty of Chemical Technology for teaching in the Master's degree program as a compulsory study resource. It deals with the basic categories of criminalistic theory and analyzes the methodological problems of criminology. In terms of content, individual chapters are oriented to the problems of forensic theory and include new progressive knowledge of forensic science. It follows the bachelor's study program. Criminology, given its content, forms of research, is an independent and extensively interdisciplinary field of science. Criminology uses a large number of methods and knowledge of other disciplines to apply creatively to its subject matter. The textbook introduces new progressive methods for identifying people and things and new methods used to investigate new crimes.